Why does the author mention an elderly mouse in paragraph 2?

A．To describe the influence or old age on mice.

B．To illustrate the effect of meager food on mice.

C．To tell us how mice's liver genes behave.

D．To inform us of the process of metabolizing drugs.

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1 What can be inferred about completely normally fed mice mentioned in the passage?

A．They will not experience free radical production.

B．They will experience more genetic rejuvenation in their lifetime.

C．They have more old liver genes to behave like young genes.

D．They are more likely to suffer from inflammation.

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2 According to the author, which of the following most interested the researchers?

A．The mice that started dieting in old age.

B．27 of those 46 old genes that continued to behave like young genes.

C．Calorie restriction that works in people.

D．Dieting that makes sure a drug is effective.

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3 According to the last two paragraphs, Spindler believes that__________

A．calorie restriction is very important to young people.

B．seeing the effect of a diet, people will like to eat less than normal.

C．dieting is not a good method to give us health and long life.

D．drugs do not have the effects of calorie restriction,

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